Meaning: 'Rely' means to depend on or trust in something or someone.

Wrong options:

• objective: 'Objective' is an adjective that describes something based on facts rather than feelings, which does not fit the grammatical structure here.
• subjective: 'Subjective' is also an adjective that refers to personal opinions or feelings, which does not fit as it does not serve as a verb in this context.
• linguistic: 'Linguistic' is an adjective related to language, which does not fit the action of depending or trusting.
• verbal: 'Verbal' is an adjective that pertains to words or language, which does not fit as it does not serve as a verb here.
• inadequate: 'Inadequate' is an adjective meaning insufficient or not enough, which does not fit the grammatical structure of the sentence.
• invaluable: 'Invaluable' is an adjective meaning extremely useful or indispensable, which does not fit as it does not serve as a verb.

Correct answer: objective

Explanation: The word 'objective' fits grammatically as it describes the nature of data observation, indicating that it is based on observable facts rather than personal feelings. This aligns with the context of comparing data observation to self-reported data.

Meaning: 'Objective' means not influenced by personal feelings or opinions; based on facts.

Wrong options:

• rely: 'Rely' is a verb that does not fit here as it does not describe the nature of data observation.
• subjective: 'Subjective' is an adjective that means based on personal opinions, which contradicts the intended meaning of being factual.
• linguistic: 'Linguistic' is an adjective related to language, which does not describe the nature of data observation.
• verbal: 'Verbal' is an adjective that pertains to words, which does not fit the context of describing data observation.
• inadequate: 'Inadequate' is an adjective meaning insufficient, which does not describe the nature of data observation.
• invaluable: 'Invaluable' is an adjective meaning extremely useful, which does not fit the context of describing objectivity.

Correct answer: verbal

Explanation: The term 'verbal' fits grammatically as it describes the skill related to language, indicating that those with weak language skills can still use observation. This aligns with the context of the sentence discussing observation methods.

Meaning: 'Verbal' refers to skills related to words or language.

Wrong options:

• rely: 'Rely' is a verb that does not fit as it does not describe a skill.
• objective: 'Objective' is an adjective that describes a type of data, not a skill, and does not fit in this context.
• subjective: 'Subjective' is an adjective that refers to personal opinions, which does not describe a skill related to language.
• linguistic: 'Linguistic' is an adjective related to language but does not fit the context of describing a skill as it is more technical.
• inadequate: 'Inadequate' is an adjective meaning insufficient, which does not describe a skill and does not fit grammatically.
• invaluable: 'Invaluable' is an adjective meaning extremely useful, which does not describe a skill.

Correct answer: invaluable

Explanation: The word 'invaluable' fits grammatically as it describes the importance of providing background information, indicating that it is extremely useful. This aligns with the context of emphasizing the significance of descriptive information.

Meaning: 'Invaluable' means extremely useful or indispensable.

Wrong options:

• rely: 'Rely' is a verb that does not fit as it does not describe the importance of providing information.
• objective: 'Objective' is an adjective that describes a type of data, which does not fit the context of describing the importance of providing information.
• subjective: 'Subjective' is an adjective that refers to personal opinions, which does not fit the context of emphasizing the importance of information.
• linguistic: 'Linguistic' is an adjective related to language, which does not describe the importance of providing information.
• verbal: 'Verbal' is an adjective that pertains to words, which does not fit the context of describing the importance of information.
• inadequate: 'Inadequate' is an adjective meaning insufficient, which contradicts the intended meaning of being extremely useful.